Acoustic Emission for Nondestructive Evaluation of Active Crack Dynamics in Concrete Wall of a Highway Bridge Due to Interaction with Freight Traffi c on Railroad that the Bridge Crosses

Acoustic Emission (AE) Sensor Technology has been used for non-destructive evaluation (NDE) of concrete back wall of a bridge on a highway crossing over a freight rail line that serves a cargo terminal. The study has three basic objectives: (i) to detect the presence of micro cracks, (ii) to obtain as much information as possible on their locations; and (iii) to determine the contribution of freight traffic on the rail road that the bridge crosses in proximity of the test back wall. AE signals originating from the activity related with cracks were recorded with the help of 8 AE sensors strategically installed for the purpose along the width and height of the wall. The AE data was recorded with the help of a Micro-II Digital DAQTM system designed for on-site real time analysis. AE data analysis detected activity due both to the pre-existing and newly generated cracks. 2D and 3D locator software AEWin has been used to determine dynamics of crack activity. AE contributions from traffic on the road and freight traffic on rail road have been quantified for different test locations. The results of AE activity due both the factors will be discussed. AE monitoring did give time and location of AE activity. The results lead to the conclusion that both the road and the rail road traffic volumes contribute to dynamic and quantifiable AE activity.

References
1. Yuyama, S., T. Okamoto and S. Nagataki. “Acoustic Emission Evaluation of Structural Integrity in Repaired Reinforced Concrete Beams,” Materials Evaluation, Volume 52, No. 1, 1994, pp. 86-90. 2. Yoon, D., W.J. Weiss and S.P. Shah. “Assessing Damage in Corroded Reinforced Concrete Using Acoustic Emission,” Journal of Engineering Mechanics, March 2000, pp. 1-11. 3. Landis, E.N. “Micro-Macro Fracture Relationship and Acoustic Emission in Concrete,” Construction and Building Materials, Volume 13, 1999, pp. 65-72. 4. Ohtsu, M., M. Shigeishi and Y. Sakata. “Nondestructive Evaluation of Defects in Concrete by Quantitative Acoustic Emission and Ultrasonics,” Ultrasonics, Volume 36, 1998, pp. 187–195. 5. Parmar, D.S. and S.R. Sharp. “Short-Term Evaluation of a Bridge Cable Using Acoustic Emission Sensors,” Virginia Transportation Research Council, Research Report No. 10-R24, 2010. 6. Parmar, D.S. and S.R. Sharp. “Acoustic Emission Studies for Nondestructive Evaluation (NDE) of Bridge Cables,” NDE/ NDT for Highways and Bridges: Structural Materials Technology, The American Society of Nondestructive Testing, Columbus, OH, 2010, pp. 686–693. 7. Parmar, D.S. and S.R. Sharp. “Remote Measurement and Analysis of Acoustic Emission from Cracks in Concrete,” ASNT 20th Annual Research Syposium and Spring Conference Paper Summaries, The American Society of Nondestructive Testing, Columbus, OH, 2011 pp. 68-73
Metrics
Usage Shares
Total Views
23 Page Views
Total Shares
0 Tweets
23
0 PDF Downloads
0
0 Facebook Shares
Total Usage
23